地下水位影响尾矿坝稳定性的结构重要度分析

Structural importance analysis of groundwater level affecting stability of tailings dam

为揭示尾矿库浸润线埋深对坝体稳定性的影响规律,以四川某尾矿库为工程研究对象,引入结构重要度系数,研究坝体不同区域浸润线埋深对稳定性的影响程度,采用BowTie模型对浸润线埋深浅事件进行全面定性分析。研究结果表明:浸润线抬升会显著降低坝体稳定性,尾矿坝堆高越高处结构重要度系数越大,堆高越高处浸润线变化对坝体稳定性的影响也越大,所以高堆尾矿库或尾矿库加高扩容工程更应重视坝体上部浸润线的监测与控制。建立的BowTie模型按照尾矿库结构将浸润线埋深浅事件划分为7种主要影响因素和5种可能产生的后果,为尾矿库工程安全管理体系的优化提供思路。研究结果能够对尾矿库的安全设计和稳定性评价起到很好的借鉴作用。

In order to reveal the influence of the buried depth of tailings pond saturation line on the dam stability,taking a certain tailing pond in Sichuan as the engineering research object,the influence of the buried depth of saturation line in different regions on the dam stability was studied,and the BowTie model was used to make a comprehensive qualitative analysis on the shallow buried depth events of saturation line.The results show that the uplift of saturation line will significantly reduce the dam stability.The higher the stacking height of tailings dam,the larger the structural importance coefficient,and the greater the influence of saturation line change on the dam stability.Therefore,the monitoring and control of saturation line on the upper part of dam should be paid more attention for the high stacking tailings pond or the heightening and expansion project of tailings pond.According to the structure of tailings pond,the established BowTie model divides the shallow buried depth events of saturation line into seven main influencing factors and five possible consequences,which provides an idea to optimize the safety management system of tailings pond project.The research results can provide a good reference for the safety design and stability evaluation of tailings pond.